/* ===================================================================
   PBS - PLATO Benchmark Stars — Design System
   =================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Playfair+Display:wght@400;600;700&display=swap');

/* ----- CSS Custom Properties (Dark Theme Default) ----- */
:root {
  color-scheme: dark;
  /* Colors */
  --bg-primary:    #0a0e1a;
  --bg-secondary:  #111827;
  --bg-card:       rgba(17, 24, 39, 0.85);
  --bg-glass:      rgba(255, 255, 255, 0.04);
  --bg-hover:      rgba(255, 255, 255, 0.06);
  --bg-input:      rgba(255, 255, 255, 0.06);

  --text-primary:  #e8eaf0;
  --text-secondary:#94a3b8;
  --text-muted:    #64748b;
  --text-heading:  #f1f5f9;

  --accent-gold:   #d4a843;
  --accent-gold-light: #e8c96a;
  --accent-blue:   #5b8def;
  --accent-blue-light: #7dabff;
  --accent-teal:   #2dd4bf;
  --accent-purple: #a78bfa;

  --b1-color:      #d4a843;
  --b2-color:      #5b8def;
  --b3-color:      #94a3b8;

  --border-color:  rgba(255, 255, 255, 0.08);
  --border-glow:   rgba(212, 168, 67, 0.3);

  --shadow-sm:     0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md:     0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg:     0 12px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow:   0 0 20px rgba(212, 168, 67, 0.15);

  /* Typography */
  --font-ui:       'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading:  'Playfair Display', Georgia, serif;

  /* Spacing */
  --radius-sm:     6px;
  --radius-md:     10px;
  --radius-lg:     16px;
  --radius-xl:     24px;

  /* Transitions */
  --transition:    0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ----- Light Theme ----- */
[data-theme="light"] {
  color-scheme: light;
  --bg-primary:    #f8f9fc;
  --bg-secondary:  #ffffff;
  --bg-card:       rgba(255, 255, 255, 0.92);
  --bg-glass:      rgba(0, 0, 0, 0.02);
  --bg-hover:      rgba(0, 0, 0, 0.04);
  --bg-input:      rgba(0, 0, 0, 0.04);

  --text-primary:  #1e293b;
  --text-secondary:#475569;
  --text-muted:    #94a3b8;
  --text-heading:  #0f172a;

  --accent-gold:   #b8922f;
  --accent-gold-light: #d4a843;
  --accent-blue:   #3b6fd6;
  --accent-blue-light: #5b8def;

  --b1-color:      #b8922f;
  --b2-color:      #3b6fd6;
  --b3-color:      #94a3b8;

  --border-color:  rgba(0, 0, 0, 0.1);
  --border-glow:   rgba(184, 146, 47, 0.2);

  --shadow-sm:     0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md:     0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg:     0 12px 40px rgba(0, 0, 0, 0.12);
  --shadow-glow:   0 0 20px rgba(184, 146, 47, 0.1);
}

/* ----- Reset & Base ----- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 15px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-ui);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

/* Subtle starfield bg */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(1px 1px at 10% 20%, rgba(255,255,255,0.15), transparent),
    radial-gradient(1px 1px at 30% 60%, rgba(255,255,255,0.1), transparent),
    radial-gradient(1px 1px at 50% 10%, rgba(255,255,255,0.12), transparent),
    radial-gradient(1px 1px at 70% 80%, rgba(255,255,255,0.08), transparent),
    radial-gradient(1px 1px at 90% 40%, rgba(255,255,255,0.1), transparent),
    radial-gradient(1.5px 1.5px at 15% 85%, rgba(212,168,67,0.2), transparent),
    radial-gradient(1.5px 1.5px at 85% 15%, rgba(91,141,239,0.15), transparent);
  z-index: 0;
  pointer-events: none;
}

[data-theme="light"] body::before {
  opacity: 0;
}

/* ----- Header ----- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  padding: 0 2rem;
  transition: background var(--transition);
}

.header-inner {
  max-width: 1440px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  height: 64px;
  gap: 2rem;
}

.logo {
  height: 40px;
  flex-shrink: 0;
  transition: filter var(--transition);
  cursor: pointer;
}

[data-theme="light"] .logo {
  filter: none;
}

.nav {
  display: flex;
  gap: 0.25rem;
  flex: 1;
}

.nav-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-ui);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.nav-icon {
  width: 17px;
  height: 17px;
  stroke: var(--accent-gold);
  fill: none;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
  transition: transform var(--transition), stroke var(--transition);
  filter: drop-shadow(0px 1px 2px rgba(0,0,0,0.3));
}

.nav-icon circle[fill="var(--accent-gold)"],
.nav-icon path[fill="var(--accent-gold)"] {
  fill: var(--accent-gold);
}

.nav-btn:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
  transform: translateY(-1px);
}

.nav-btn:hover .nav-icon {
  transform: scale(1.08);
  stroke: var(--accent-gold-light, #fbbf24);
}

[data-theme="light"] .nav-icon {
  stroke: #d97706;
  filter: drop-shadow(0px 1px 1px rgba(0,0,0,0.15));
}

[data-theme="light"] .nav-icon circle[fill="var(--accent-gold)"],
[data-theme="light"] .nav-icon path[fill="var(--accent-gold)"] {
  fill: #d97706;
}

.nav-btn.active {
  color: var(--accent-gold);
  background: rgba(212, 168, 67, 0.1);
}

.nav-btn.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 2px;
  background: var(--accent-gold);
  border-radius: 1px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}



/* Select & Dropdown menus */
select,
.schema-select {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: 0.8rem;
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  outline: none;
}

select option,
.schema-select option {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  padding: 0.4rem 0.6rem;
}

#schema-select {
  font-weight: 700;
}

#schema-select option.default-version {
  font-weight: 700;
  color: var(--accent-gold);
}

/* ----- Main Content ----- */
.main {
  position: relative;
  z-index: 1;
  max-width: 1440px;
  margin: 0 auto;
  padding: 1.5rem 2rem 3rem;
}

.page {
  display: none;
  animation: fadeIn 0.3s ease;
}

.page.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ----- Cards ----- */
.card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow-md);
  transition: all var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--border-glow);
}

.card-title {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  color: var(--text-heading);
  margin-bottom: 1rem;
}

/* ----- Search Bar ----- */
.search-bar {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.search-input {
  flex: 1;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.65rem 1rem;
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: 0.95rem;
  transition: all var(--transition);
}

.search-input:focus {
  outline: none;
  border-color: var(--accent-gold);
  box-shadow: 0 0 0 3px rgba(212, 168, 67, 0.15);
}

.search-input::placeholder {
  color: var(--text-muted);
}

/* ----- Buttons ----- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.25rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.btn:hover {
  background: var(--bg-hover);
  border-color: var(--accent-gold);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-gold), var(--accent-gold-light));
  border: none;
  color: #0a0e1a;
  font-weight: 600;
}

.btn-primary:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}

.btn-accent {
  background: var(--bg-glass);
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

.btn-accent:hover {
  background: rgba(91, 141, 239, 0.1);
  box-shadow: 0 0 10px rgba(91, 141, 239, 0.2);
}

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
}

/* ----- Data Table ----- */
.table-container {
  overflow-x: auto;
  width: 100%;
  max-width: 100%;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  -webkit-overflow-scrolling: touch;
}

.table-container::-webkit-scrollbar {
  height: 8px;
}

.table-container::-webkit-scrollbar-track {
  background: var(--bg-secondary);
  border-radius: 4px;
}

.table-container::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 4px;
}

.table-container::-webkit-scrollbar-thumb:hover {
  background: var(--accent-gold);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.data-table th {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  padding: 0.5rem 0.5rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
}

.data-table th:hover {
  color: var(--accent-gold);
}

.data-table th .sort-arrow {
  margin-left: 4px;
  opacity: 0.3;
}

.data-table th.sorted .sort-arrow {
  opacity: 1;
  color: var(--accent-gold);
}

.data-table td {
  padding: 0.4rem 0.5rem;
  font-size: 0.85rem;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
}
.data-table td.col-identifier {
  max-width: 350px;
}

.data-table tbody tr {
  transition: background var(--transition);
  cursor: pointer;
}

.data-table tbody tr:hover {
  background: var(--bg-hover);
}

/* Benchmark level badges */
.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.badge-b1 {
  background: rgba(212, 168, 67, 0.15);
  color: var(--b1-color);
  border: 1px solid rgba(212, 168, 67, 0.3);
}

.badge-b2 {
  background: rgba(91, 141, 239, 0.15);
  color: var(--b2-color);
  border: 1px solid rgba(91, 141, 239, 0.3);
}

.badge-b3 {
  background: rgba(148, 163, 184, 0.12);
  color: var(--b3-color);
  border: 1px solid rgba(148, 163, 184, 0.2);
}

/* ----- Pagination ----- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.pagination-buttons {
  display: flex;
  gap: 0.5rem;
}

/* ----- Star Detail Page ----- */
.detail-header {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.detail-section {
  margin-bottom: 1.5rem;
  padding: 1.5rem;
}

.collapsible-header {
  cursor: pointer;
  user-select: none;
  transition: color var(--transition);
}

.collapsible-header:hover {
  color: var(--accent-gold);
}

.collapse-icon {
  display: inline-block;
  transition: transform 0.2s ease;
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-left: 0.5rem;
}

.collapsible-header:hover .collapse-icon {
  color: var(--accent-gold);
}

.detail-section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.detail-section-header .card-title {
  margin-bottom: 0;
}


.param-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
}

.param-item {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.85rem;
}

.param-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.2rem;
}

.param-value {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
}

.param-unit {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-left: 0.25rem;
}

.param-source {
  font-size: 0.65rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

/* ----- Simbad Page ----- */
.simbad-result {
  margin-top: 1.5rem;
}

.simbad-card {
  margin-bottom: 1rem;
}

.ident-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.5rem;
}

.ident-tag {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.25rem 0.65rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.accent-link, .bib-link {
  color: var(--accent-blue);
  text-decoration: underline;
  transition: all var(--transition);
}

[data-theme="dark"] .accent-link, 
[data-theme="dark"] .bib-link {
  color: var(--accent-teal);
}

[data-theme="light"] .accent-link, 
[data-theme="light"] .bib-link {
  color: var(--accent-blue);
}

.accent-link:hover, .bib-link:hover {
  color: var(--accent-gold);
  opacity: 0.8;
}

/* ----- TAP Page ----- */
.tap-editor {
  width: 100%;
  min-height: 120px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  color: var(--text-primary);
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
  resize: vertical;
  transition: border-color var(--transition);
}

.tap-editor:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(91, 141, 239, 0.15);
}

.tap-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
}

.tap-examples {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 0.75rem;
}

.tap-example {
  font-size: 0.75rem;
  padding: 0.3rem 0.6rem;
}

.tap-example-gold {
  border-color: var(--accent-gold);
  background: rgba(245, 158, 11, 0.12);
  color: var(--accent-gold);
}
.tap-example-gold:hover {
  background: rgba(245, 158, 11, 0.25);
  border-color: var(--accent-gold);
}

.tap-example-silver {
  border-color: #94a3b8;
  background: rgba(148, 163, 184, 0.12);
  color: #94a3b8;
}
.tap-example-silver:hover {
  background: rgba(148, 163, 184, 0.25);
  border-color: #94a3b8;
}
[data-theme="light"] .tap-example-silver {
  color: #475569;
}

.tap-example-bronze {
  border-color: #b45309;
  background: rgba(180, 83, 9, 0.12);
  color: #d97706;
}
.tap-example-bronze:hover {
  background: rgba(180, 83, 9, 0.25);
  border-color: #b45309;
}
[data-theme="light"] .tap-example-bronze {
  color: #b45309;
}

.tap-example-select {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: 0.75rem;
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  outline: none;
  transition: all var(--transition);
}

.tap-example-select:hover {
  background-color: var(--bg-hover);
  border-color: var(--accent-gold);
}

.tap-example-select option {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  padding: 0.4rem 0.6rem;
}

/* TAP Result Tabs */
.tap-tab-bar {
  display: flex;
  align-items: flex-end;
  gap: 0.35rem;
  border-bottom: 1px solid var(--border-color);
  margin-top: 1.5rem;
  overflow-x: auto;
  padding-bottom: 0;
}

.tap-tab-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.85rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-bottom: none;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  user-select: none;
  transition: all var(--transition);
  position: relative;
  top: 1px;
  white-space: nowrap;
}

.tap-tab-item:hover {
  color: var(--text-primary);
  background-color: var(--bg-hover);
}

.tap-tab-item.active {
  color: var(--accent-gold);
  background-color: var(--bg-card);
  border-color: var(--accent-gold) var(--accent-gold) transparent var(--accent-gold);
  font-weight: 600;
}

.tap-tab-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  font-size: 0.75rem;
  line-height: 1;
  color: var(--text-muted);
  transition: all 0.15s ease;
}

.tap-tab-close:hover {
  background: rgba(239, 68, 68, 0.2);
  color: #ef4444;
}

/* ----- HR Diagram ----- */
.hr-container {
  width: 100%;
  position: relative;
}

.hr-svg {
  width: 100%;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}

/* ----- TAP Layout ----- */
.tap-layout {
  display: grid;
  grid-template-columns: var(--tap-sidebar-width, 336px) 4px 1fr;
  gap: 0;
  align-items: start;
  column-gap: 0;
}

.tap-sidebar {
  min-width: 0;
}

.tap-main {
  margin-left: 1.5rem;
  min-width: 0;
  max-width: 100%;
}

#tap-result {
  margin-top: 1.5rem;
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
}

/* Resize handle between sidebar and main */
.tap-resize-handle {
  width: 4px;
  cursor: col-resize;
  background: var(--border-color);
  border-radius: 2px;
  align-self: stretch;
  min-height: 200px;
  transition: background 0.2s;
  position: relative;
  margin: 0 0.5rem;
  flex-shrink: 0;
}

.tap-resize-handle::after {
  content: '⋮';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1;
  pointer-events: none;
}

.tap-resize-handle:hover,
.tap-resize-handle.dragging {
  background: var(--accent-blue);
}

.sidebar-title {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  color: var(--text-heading);
}

.sidebar-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

.data-model-list {
  max-height: calc(100vh - 300px);
  overflow-y: auto;
  font-size: 0.85rem;
  padding-right: 0.5rem;
}

.data-model-item {
  padding: 0.65rem 0.75rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.25rem;
  transition: background var(--transition);
}

.data-model-item:hover {
  background: var(--bg-hover);
}

.dm-name {
  color: var(--accent-gold);
  font-family: var(--font-ui);
  font-weight: 600;
}

.dm-type {
  color: var(--text-muted);
  font-size: 0.75rem;
}

.dm-unit {
  color: var(--accent-blue);
  font-size: 0.75rem;
}

.dm-desc {
  color: var(--text-secondary);
  font-size: 0.75rem;
  margin-top: 0.2rem;
  line-height: 1.3;
}

@media (max-width: 1024px) {
  .tap-layout {
    grid-template-columns: 1fr;
  }
  .tap-resize-handle {
    display: none;
  }
  .tap-main {
    margin-left: 0;
  }
}


.otype-badge {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-left: 0.75rem;
  font-weight: 500;
  cursor: help;
  border-bottom: 2px dotted var(--border-color);
  padding-bottom: 1px;
}

.otype-badge:hover {
  color: var(--text-main);
  border-bottom-color: var(--accent-gold);
}

.otype-link {
  cursor: help;
  border-bottom: 1px dotted var(--text-muted);
  transition: all var(--transition);
}

.otype-link:hover {
  color: var(--accent-gold);
  border-bottom-color: var(--accent-gold);
}

.hr-controls {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  align-items: center;
}

.hr-tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.85rem;
  font-size: 0.8rem;
  box-shadow: var(--shadow-lg);
  z-index: 50;
  opacity: 0;
  transition: opacity 0.15s;
}

.hr-tooltip.visible {
  opacity: 1;
}

.hr-legend {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  font-size: 1.1rem;
}

.hr-legend-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-secondary);
}

.hr-legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

/* ----- Loader ----- */
.loader {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid var(--border-color);
  border-top-color: var(--accent-gold);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ----- Status messages ----- */
.status-msg {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

.status-msg.info {
  background: rgba(91, 141, 239, 0.1);
  border: 1px solid rgba(91, 141, 239, 0.3);
  color: var(--accent-blue-light);
}

.status-msg.error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #f87171;
}

.status-msg.success {
  background: rgba(45, 212, 191, 0.1);
  border: 1px solid rgba(45, 212, 191, 0.3);
  color: var(--accent-teal);
}

/* ----- SIMBAD Badge ----- */
.simbad-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  color: var(--accent-blue-light);
  padding: 0.35rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-decoration: none;
  transition: all 0.2s;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.simbad-badge:hover {
  background: rgba(91, 141, 239, 0.1);
  border-color: var(--accent-blue);
  transform: translateY(-1px);
}

/* ----- Modal ----- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.2s ease;
}

.modal-card {
  animation: scaleIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.9); }
  to   { opacity: 1; transform: scale(1); }
}

.close-btn:hover {
  color: var(--accent-gold) !important;
  transform: scale(1.1);
}

.simbad-badge.disabled {
  opacity: 0.2;
  cursor: default;
  pointer-events: none;
  filter: grayscale(1);
}

.simbad-star {
  color: #ffca28;
  font-size: 1rem;
  text-shadow: 0 0 8px rgba(255, 202, 40, 0.5);
}

.hover-scale {
  transition: transform 0.2s, box-shadow 0.2s;
}

.hover-scale:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-gold-dim);
}

/* ----- Responsive ----- */
@media (max-width: 768px) {
  .header-inner {
    gap: 1rem;
    padding: 0 1rem;
  }

  .logo { height: 30px; }

  .nav-btn { padding: 0.4rem 0.6rem; font-size: 0.8rem; }

  .main { padding: 1rem; }

  .param-grid { grid-template-columns: 1fr 1fr; }

  .search-bar { flex-direction: column; }
}

/* ----- Equation Hover Tooltip ----- */
.eq-ref {
  position: relative;
  display: inline-block;
  color: var(--accent-gold);
  font-weight: 600;
  cursor: help;
  border-bottom: 1px dotted var(--accent-gold);
  padding: 0 2px;
  transition: all var(--transition);
}

.eq-ref:hover {
  color: var(--accent-gold-light, #fbbf24);
  border-bottom-color: var(--accent-gold-light, #fbbf24);
  background: rgba(245, 158, 11, 0.15);
  border-radius: var(--radius-sm);
}

.eq-tooltip {
  visibility: hidden;
  opacity: 0;
  width: max-content;
  min-width: 240px;
  max-width: 320px;
  background: var(--bg-card);
  color: var(--text-primary);
  text-align: left;
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  position: absolute;
  z-index: 1000;
  bottom: 130%;
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
  border: 1px solid var(--border-glow, rgba(212, 168, 67, 0.4));
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(12px);
  pointer-events: none;
  font-family: var(--font-ui);
  font-weight: normal;
  white-space: normal;
}

.eq-tooltip::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  margin-left: -6px;
  border-width: 6px;
  border-style: solid;
  border-color: var(--bg-card) transparent transparent transparent;
}

.eq-ref:hover .eq-tooltip {
  visibility: visible;
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.eq-tooltip-title {
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--accent-gold);
  margin-bottom: 0.35rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.eq-tooltip-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.eq-tooltip-formula {
  font-family: 'Times New Roman', Georgia, serif;
  font-size: 1.05rem;
  font-style: normal;
  background: rgba(0, 0, 0, 0.25);
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-sm);
  text-align: center;
  color: var(--accent-blue-light, #93c5fd);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

[data-theme="light"] .eq-tooltip {
  background: #ffffff;
  border-color: var(--accent-gold);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

[data-theme="light"] .eq-tooltip::after {
  border-color: #ffffff transparent transparent transparent;
}

[data-theme="light"] .eq-tooltip-formula {
  background: rgba(91, 141, 239, 0.08);
  color: #1e40af;
  border-color: rgba(91, 141, 239, 0.2);
}

/* ----- Page Loading Screen ----- */
#page-loading {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 65vh;
  text-align: center;
  padding: 3rem 1.5rem;
}

#page-loading.active,
html.loading-star-detail #page-loading {
  display: flex !important;
}

html.loading-star-detail #page-home {
  display: none !important;
}

#loading-logo {
  max-width: 420px;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.35);
  transition: transform 0.3s ease;
}

[data-theme="light"] #loading-logo {
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.12);
}

/* ----- Copyable Badges & Star Name Copy Button ----- */
.copyable-badge {
  cursor: pointer !important;
  user-select: text;
  transition: transform 0.15s ease, filter 0.15s ease, background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.15s ease;
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.copyable-badge:hover {
  transform: translateY(-1.5px);
  filter: brightness(1.15);
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.25);
}

.copyable-badge:active {
  transform: translateY(0);
}

.copyable-badge.copied {
  background: var(--accent-green, #10b981) !important;
  color: #ffffff !important;
  border-color: #059669 !important;
  box-shadow: 0 0 10px rgba(16, 185, 129, 0.4);
}

.copy-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  padding: 0.25rem 0.45rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  vertical-align: middle;
}

.copy-btn:hover {
  background: var(--bg-hover);
  color: var(--accent-gold);
  border-color: var(--accent-gold);
  transform: translateY(-1px);
}

.copy-btn:active {
  transform: translateY(0);
}

.copy-btn.copied {
  background: var(--accent-green, #10b981) !important;
  color: #ffffff !important;
  border-color: #059669 !important;
}

.aliases-toggle-btn:hover {
  background: var(--bg-hover) !important;
  color: var(--accent-gold) !important;
  border-color: var(--accent-gold) !important;
}

.aliases-toggle-btn:hover .collapse-icon {
  color: var(--accent-gold);
}

/* ----- Copy Toast Notification ----- */
#pbs-toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.pbs-toast {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--accent-gold);
  padding: 0.65rem 1.1rem;
  border-radius: var(--radius-sm, 6px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.85rem;
  font-weight: 500;
  animation: pbsToastIn 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: auto;
  backdrop-filter: blur(12px);
}

.pbs-toast strong {
  color: var(--accent-gold);
}

@keyframes pbsToastIn {
  from {
    opacity: 0;
    transform: translateY(14px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}